British Journal of Nutrition

Dietary Surveys and Nutritional Epidemiology

Habitual sugar intake and cognitive function among middle-aged and older Puerto Ricans without diabetes

Xingwang Yea1a2, Xiang Gaoa3a4, Tammy Scotta5 and Katherine L. Tuckera1a2 c1

a1 Jean Mayer US Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA

a2 Department of Health Sciences, Northeastern University, Boston, MA, USA

a3 Department of Nutrition, Harvard University School of Public Health, Boston, MA, USA

a4 Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA, USA

a5 Department of Psychiatry, Tufts Medical Center, Boston, MA, USA

Abstract

Intake of added sugars, mainly fructose and sucrose, has been associated with risk factors for cognitive impairment, such as obesity, the metabolic syndrome and type 2 diabetes. The objective of this analysis was to examine whether habitual intakes of total sugars, added sugars, sugar-sweetened beverages or sweetened solid foods are associated with cognitive function. The present study included 737 participants without diabetes, aged 45–75 years, from the Boston Puerto Rican Health Study, 2004–9. Cognitive function was measured with a battery of seven tests: Mini-Mental State Examination (MMSE), word list learning, digit span, clock drawing, figure copying, and Stroop and verbal fluency tests. Usual dietary intake was assessed with a validated FFQ. Greater intakes of total sugars, added sugars and sugar-sweetened beverages, but not of sugar-sweetened solid foods, were significantly associated with lower MMSE score, after adjusting for covariates. Adjusted OR for cognitive impairment (MMSE score < 24) were 2·23 (95 % CI 1·24, 3·99) for total sugars and 2·28 (95 % CI 1·26, 4·14) for added sugars, comparing the highest with lowest intake quintiles. Greater intake of total sugars was also significantly associated with lower word list learning score. In conclusion, higher sugar intake appears to be associated with lower cognitive function, but longitudinal studies are needed to clarify the direction of causality.

(Received September 15 2010)

(Revised February 28 2011)

(Accepted March 09 2011)

(Online publication June 01 2011)

Correspondence:

c1 Corresponding author: Dr Katherine L. Tucker, email kl.tucker@neu.edu

Footnotes

Abbreviations: HFCS, high-fructose corn syrup; MMSE, Mini-Mental State Examination; SSB, sugar-sweetened beverage